"We could have witch trials and burn them at the stake for spreading global warming heresy ."

James Hansen, one of the world's leading climate scientists, will today call for the chief executives of large fossil fuel companies to be put on trial for high crimes against humanity and nature, accusing them of actively spreading doubt about global warming in the same way that tobacco companies blurred the links between smoking and cancer. Hansen will use the symbolically charged 20th anniversary of his groundbreaking speech to the US Congress - in which he was among the first to sound the alarm over the reality of global warming - to argue that radical steps need to be taken...